使用STM8S003更改选项字节AFR0的默认值可以在源代码中插入此过程吗？

@ST社区（ST员工）来自STM8团队的任何人？



以下为原文

@ST Community (ST Employee)​ anyone from team STM8?

嗨，我正在使用STM8S001J。
 
我不使用库，但是阅读数据表我发现编写选项字节非常类似于编写Eeprom，所以我实现了几个简单的函数。您可以将它与您的产品进行比较，以验证它是否相同。这是我编写选项字节的函数：
这是从它读取（它与Eeprom相同）：
最后，这是一个如何使用它的示例：
每个选项字节必须以直接和补充形式写入。在这种情况下，我想要OPT2 = 0x03，所以我在OPT2中写入0x03，在NOPT2中写入0xFC。
 
我使用OptionWrite作为实验，所以它没有经过全面测试，但它确实有效。
 
很抱歉列表中的标签/缩进很混乱，但在“代码”框中复制/粘贴后无法编辑它们。
 
任何STM8大师的确认都将受到高度赞赏。谢谢。



以下为原文

Hi, I'm using the STM8S001J.

I don't use libraries, but reading the datasheet I discovered that writing the option bytes is very similar to writing Eeprom, so I realized a couple of simple functions. You can compare it with yours to verify if it's the same thing. This is the function I wrote to program an option byte:

• void OptionWrite(char *addr, unsigned char data) // write a byte to OPTIONS (read=EarRead)
  
• {
  
• FLASH_DUKR = 0xAE; // unlock the EEprom
  
• FLASH_DUKR = 0x56; //
  
• FLASH_CR2 |= 0x80; // unlock the OPTION (set bit OPT)
  
• FLASH_NCR2 &= 0x7F; // (clear bit NOPT)
  
• *addr = data; // write data
  
• while((FLASH_IAPSR & 0x04) == 0); // wait for EOP (end-of-programming) set
  
• FLASH_IAPSR = 0x00; // Write protect the EEPROM clearing DUL bit
  
• }
  

and this is to read from it (it's the same as for the Eeprom):

• unsigned char EarRead(char *addr) // read a byte from EEprom
  
• {
  
• BYTE data;
  
• 
  
• data = *addr; // read data
  
• return data;
  
• }
  

Finally, this is an example of how to use it:

• mc = EarRead((char *)0x4803); // read option byte OPT2 from EEprom
  
• if(mc != 0x03) // if option programming different from requested one
  
• {
  
• OptionWrite((char *)0x4803, 0x03); // write OPT2 (0x4803)
  
• OptionWrite((char *)0x4804, 0xFC); // write NOPT2 (0x4804)
  
• }
  

Every option byte must be written in direct and complemented form. In this case I wanted the OPT2 = 0x03, so I wrote 0x03 in OPT2 and 0xFC in NOPT2.

I used the OptionWrite just as an experiment, so it's NOT fully tested, but it worked.

Sorry for confused tabs/indent in listings, but it's impossible to edit them after a copy/paste in the "code" box.

Any confirmation by the STM8 gurus will be highly appreciated. Thanks.